The ADS-B Capstone GDL-90 was the first practical Universal Access ransceiver
(UAT) or datalink transceiver. The GDL-90 broadcasts position and aircraft performance data while receiving air traffic and weather data. ADS-B equipment is now required in all U.S. aircraft.
This object is on display in Thomas W. Haas We All Fly at the National Air and Space Museum in Washington, DC.